Silas whitman



ated gratta SILAS WHITMAN, 0F LONDONDERRY, VERMONT.

Letters Patent N 99,991,'datefl February 15, 1870.

The Schedule referred to in these Letters Patent and making part lczf the same. i

1o all whom it may concern:

Be it known that 1, SILAS \VHITMAN, of Londonderry, inthe county ot' Windham, and in the State of Vermont, have invented certain new and useful Improvements in Cam-Levers; and do hereby declare that the following isa full, clear, and exact description thereof, reference beine,r had to the accompam ing drawings and to the let-ters of reference marked thereon, makinga part ot' this specification. t

.lhe nature of my invention consists in the construction Aof a cam by the use of which is obviated the necessity of having springs, Sto., to bring back to place anything which the cam has pressed down.

In order to enable others skilledin the art to which my invention appertains to make and use the same, I will now proceed to describeits.construction andoperation, referring to the annexed drawings, which represent the camand an attachment, to show the Inanner of workingy the same. v .I c

A represents the cam, 'which on its upper or front side along its circumference is provided with a raised ange, B, and on one side with a handle or lever, C.

Dre-presents the article to which the cam is pivoted.

which moves in a guide, F, and is groove-d on its inner side in sueh a manner as to grasp the ange B.

This cam may be used on power-punches, tire-np'- setting machines, or any other machine where arcate is needed, and will do awa-y with springs, 85e., to bring back t0place anythin,r which the cam haspressed down.

Having thus fnlly described my invention,

What- I cla-im as new, and'desire to secure by Letters Patent, isc,

The combination of the canrA; with its circumferential flange B and handle C, with `the grooved grasp and slide E and keeper F, all substantially as set forth. i c

ln testimony that Iclaim the foregoing, I have hereunto set my hand this 28th dayv of August, 1869.

Witnesses: SILAS WHITMAN. i R. E. GORDON, i

C. A. WmTnAN.

E is the bolt or punch, 85e., that the cam operates, 

